net/mlx5: Fix SQ offset in QPs with small RQ

Correct the formula for calculating the RQ page remainder,
which should be in byte granularity.  The result will be
non-zero only for RQs smaller than PAGE_SIZE, as an RQ size
is a power of 2.

Divide this by the SQ stride (MLX5_SEND_WQE_BB) to get the
SQ offset in strides granularity.

Fixes: d7037ad73daa ("net/mlx5: Fix QP fragmented buffer allocation")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/wq.c b/drivers/net/ethernet/mellanox/mlx5/core/wq.c
index 86478a6b99c5068e13688f2556e954ee3b3f9486..c8c315eb512804033fd88723c217504007010453 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/wq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/wq.c
@@ -139,14 +139,15 @@ int mlx5_wq_qp_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
                      struct mlx5_wq_ctrl *wq_ctrl)
 {
        u32 sq_strides_offset;
+       u32 rq_pg_remainder;
        int err;
 
        mlx5_fill_fbc(MLX5_GET(qpc, qpc, log_rq_stride) + 4,
                      MLX5_GET(qpc, qpc, log_rq_size),
                      &wq->rq.fbc);
 
-       sq_strides_offset =
-               ((wq->rq.fbc.frag_sz_m1 + 1) % PAGE_SIZE) / MLX5_SEND_WQE_BB;
+       rq_pg_remainder   = mlx5_wq_cyc_get_byte_size(&wq->rq) % PAGE_SIZE;
+       sq_strides_offset = rq_pg_remainder / MLX5_SEND_WQE_BB;
 
        mlx5_fill_fbc_offset(ilog2(MLX5_SEND_WQE_BB),
                             MLX5_GET(qpc, qpc, log_sq_size),